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arXiv 2103.04720math.AP
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二阶索伯列夫空间中的Lipschitz逼近与变量变换公式

On Lipschitz approximations in second order Sobolev spaces and the change of variables formula

Paz Hashash, Alexander Ukhlov

摘要:

本文研究了索伯列夫空间$W^2_{p,\loc}(Ω)$,$Ω\subset\mathbb R^n$中函数用Lipschitz连续函数的逼近.证明了若$f\in W^2_{p,\loc}(Ω)$,$1\leq p<\infty$,则存在闭集序列$\{A_k\}_{k=1}^{\infty},A_k\subset A_{k+1}\subset Ω$,使得约束$f \vert_{A_k}$是Lipschitz连续函数且$\cp_p\left(S\right)=0$,$S=Ω\setminus\bigcup_{k=1}^{\infty}A_k$ .利用这些近似,我们证明了具有Luzin容量测度$N$ -性质的索伯列夫空间$W^2_{p,\loc}(Ω;\mathbb R^n)$中映射的Lebesgue积分的变量变换公式.

英文摘要:

In this paper we study approximations of functions of Sobolev spaces $W^2_{p,\loc}(Ω)$, $Ω\subset\mathbb R^n$, by Lipschitz continuous functions. We prove that if $f\in W^2_{p,\loc}(Ω)$, $1\leq p<\infty$, then there exists a sequence of closed sets $\{A_k\}_{k=1}^{\infty},A_k\subset A_{k+1}\subset Ω$, such that the restrictions $f \vert_{A_k}$ are Lipschitz continuous functions and $\cp_p\left(S\right)=0$, $S=Ω\setminus\bigcup_{k=1}^{\infty}A_k$. Using these approximations we prove the change of variables formula in the Lebesgue integral for mappings of Sobolev spaces $W^2_{p,\loc}(Ω;\mathbb R^n)$ with the Luzin capacity-measure $N$-property.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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